Across
- 2. sum of all the interior angles is 1440°
- 6. a regular quadrilateral, which means that it has four equal sides and four equal angles
- 8. a 5-sided polygon
- 9. the set of all points in a plane that are at a given distance from a given point
- 11. to divide something into two equal parts
- 17. a triangle in which all three sides are equal
- 18. a figure with at least three straight sides and angles
- 19. the intersection of the medians
- 21. a point or line common to lines or surfaces that intersect
- 23. a shape with seven straight sides
- 27. dozen
- 28. a polygon that is equiangular and equilateral
- 29. a triangle that has two sides of equal length
- 32. occur when two circles on the same plane intersect at exactly one point, but one circle lies outside the other circle
- 33. the regular one has 27 diagonals
Down
- 1. the point where the angle bisectors intersect
- 3. an angle formed between the side of a shape and the side next to it, when this side is extended
- 4. occur when two circles on the same plane intersect at exactly one point and one circle lies within the other
- 5. an angle of a polygon contained between two adjacent sides
- 7. a polygon with four edges (or sides) and four vertices
- 10. a line segment extending from the center of a circle or sphere to the circumference
- 12. perimeter of a circle
- 13. the sum of all the internal angles of it is 1080°
- 14. a circle which passes through all the vertices of the polygon
- 15. at an angle of 90° to a given line
- 16. a line from the center of a regular polygon at right angles to any of its sides
- 20. a triangle that has all of its vertices on a circle
- 22. a straight line intersecting the circle at two points
- 24. part of the circumference
- 25. a straight line that touches the circle at one point
- 26. a polygon with three edges and three vertice
- 30. the plane figure enclosed by two radii of a circle or ellipse and the arc between them
- 31. honeycombed